1. This Wonderful World

One of the great things about our world is that there is still so much mystery left in it. Archaeologists are constantly digging up new artifacts and structures whose purposes have been lost to history. You won't believe some of these finds and the theories about their origins.

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2. The Upton Chamber

The Upton Chamber - whose opening is pictured above - is one such archaeological mystery. The chamber is thought to be over 400 years old and believed to be a root cellar for ancient Native Americans or early Europeans. Archaeologists are shocked at the intricacy of its beehive design and advanced architecture.

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3. The London Hammer

This hammer is an oddity that lends itself to the belief of time travel. The hammer's head is made of 96 percent pure iron, much purer than any thing nature could provide. Here's the kicker, the hammer is carbon dated nearly 500 million years ago and the rock it's encased in was dated nearly 400 million years old.

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4. The Bosnian Pyramids

Though the focus has always been on the Egyptian pyramids, there are actually pyramids all over the world. One such set of pyramids are the Bosnian Pyramids located near Visoko, Bosnia. Researchers don't know much about the grass-covered pyramids, but they do say that they were built with the same precision as their Egyptian cousins.

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5. The Voynich Manuscripts

The Voynich Manusripts are a collection of drawings and what are thought to be words, though not even the best decoders in the world have been able to decipher the language. Some people think that it is a hoax, but believers point to the fact that the pages are organized and the script stays consistent throughout. Theories abound but include the idea that God wrote it through a human surrogate or that it is an alien language.

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6. The Antikythera Mechanism

Though the real use of this device is not truly known, archaeologists believe that it was an astronomy tool used by the ancient Greeks over 2000 years ago. The mechanism was majorly advanced for that time, and there would not be other similar technologies used until the 1400s.

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7. The Rongorongo Tablets

When most people think about the mysteries of Easter Island they think of the giant Moai statues. Those yet to be explained giants overshadow other mysteries of the island like the Rongorongo tablets. The hieroglyphs on these tablets have yet to be deciphered and add another layer of mystery to Easter Island.

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8. Baigong Pipes

At first glance there is nothing out of the ordinary about these rusted iron pipes. The real mystery is why they are where they are in the first place. They are found on top of a mountain which is completely inhospitable to humans. Their function and how they ended up there remain a mystery.

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9. The Baghdad Battery

The Baghdad Battery has caused a rift in the scientific community because some people don't think it was used as a battery at all while others swear it has to be. Replications have been shown to put out a small charge which would make this one of the oldest known forms of a battery. Though the idea of the world's first battery is a romantic one, the true use of the Baghdad Battery may be lost in time forever.

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10. The Stone Spheres of Costa Rica

These are perhaps one of the strangest and most unexplained archaeological finds ever. First of all, these stones are almost perfectly cylindrical which is a feat that is nearly impossible even with modern machinery. What is even more incredible is that the nearest quarry where these stones, weighing up to 16 tons, are found is over 50 miles away from the closest spheres.

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11. The Salzburg Cube

The Salzburg Cube is rather polarizing as some people think it is nothing more than a piece of rock while others believe it to be proof of an ancient alien race. There has been much investigation into the cube and the standing theory is that it was artificially manufactured, though it was found in a piece of coal that was presumed to be about 60 million years old. Given that people don't even know if it was actually manufactured, there are few theories as to what the Salzburg Cube could have been used for.

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12. The Aluminum Wedge of Aiud

If this were a piece of stone it would still be pretty mysterious since the items it was found around were dated to be at least 2.5 million years old. The thing is that this wedge is not stone, it is aluminum, which was hard to produce even by the 1800s. Some call it a hoax while others call it definitive proof that extraterrestrials exist.

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13. Waffle Rock

You can travel the world but sometimes the greatest mysteries are right here in the U S of A. This rock in West Virginia has baffled archaeologists for ages. Some say that the unique geometric designs could form naturally while others believe that advanced technology was used to form the waffle pattern. We may never know how the waffle rock was formed, but it is super cool to look at.